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ACPI: PCI: simplify buffer management for evaluating _PRT 

Previously, acpi_pci_irq_add_prt() did all its own buffer management.
But now that we have ACPI_ALLOCATE_BUFFER, we no longer need to do
that management.  And we don't have to call acpi_get_irq_routing_table()
twice (once to learn the size of the buffer needed, and again to
actually get the table).

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Bjorn Helgaas 2008-12-08 21:30:15 -07:00 committed by Len Brown
parent 3b8249de43
commit 2320ac6cb0
1 changed files with 12 additions and 40 deletions
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52
drivers/acpi/pci_irq.c
View File

@ -243,55 +243,29 @@ acpi_pci_irq_del_entry(int segment, int bus, struct acpi_prt_entry *entry)
int acpi_pci_irq_add_prt(acpi_handle handle, int segment, int bus)
{
acpi_status status = AE_OK;
char *pathname = NULL;
struct acpi_buffer buffer = { 0, NULL };
struct acpi_pci_routing_table *prt = NULL;
struct acpi_pci_routing_table *entry = NULL;
acpi_status status;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
struct acpi_pci_routing_table *entry;
static int first_time = 1;
pathname = kzalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
if (!pathname)
return -ENOMEM;
if (first_time) {
acpi_prt.count = 0;
INIT_LIST_HEAD(&acpi_prt.entries);
first_time = 0;
}
/*
* NOTE: We're given a 'handle' to the _PRT object's parent device
* (either a PCI root bridge or PCI-PCI bridge).
*/
buffer.length = ACPI_PATHNAME_MAX;
buffer.pointer = pathname;
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
/* 'handle' is the _PRT's parent (root bridge or PCI-PCI bridge) */
status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
if (ACPI_FAILURE(status))
return -ENODEV;
printk(KERN_DEBUG "ACPI: PCI Interrupt Routing Table [%s._PRT]\n",
pathname);
(char *) buffer.pointer);
/*
* Evaluate this _PRT and add its entries to our global list (acpi_prt).
*/
kfree(buffer.pointer);
buffer.length = 0;
buffer.length = ACPI_ALLOCATE_BUFFER;
buffer.pointer = NULL;
kfree(pathname);
status = acpi_get_irq_routing_table(handle, &buffer);
if (status != AE_BUFFER_OVERFLOW) {
ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]",
acpi_format_exception(status)));
return -ENODEV;
}
prt = kzalloc(buffer.length, GFP_KERNEL);
if (!prt) {
return -ENOMEM;
}
buffer.pointer = prt;
status = acpi_get_irq_routing_table(handle, &buffer);
if (ACPI_FAILURE(status)) {
@ -301,16 +275,14 @@ int acpi_pci_irq_add_prt(acpi_handle handle, int segment, int bus)
return -ENODEV;
}
entry = prt;
entry = buffer.pointer;
while (entry && (entry->length > 0)) {
acpi_pci_irq_add_entry(handle, segment, bus, entry);
entry = (struct acpi_pci_routing_table *)
((unsigned long)entry + entry->length);
}
kfree(prt);
kfree(buffer.pointer);
return 0;
}